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https://www.washingtonpost.com/wp-apps/imrs.php?src=https://arc-anglerfish-washpost-prod-washpost.s3.amazonaws.com/public/PHRZXP2GMFOQUNRPNQKSWKFNJU.JPG&w=1440Eight years ago, Biden helped formalize Trump’s victory. On Monday, Harris did the same. In between, a pro-Trump mob attacked Biden’s certification.